Hardy Princess Spool Cap
thingiverse
This is a cap sized to fit on the end of the spools for my Hardy Princess fly reel meant to keep grit out of the inside of the spool when it's not on a reel. It will probably work on other Hardy reel spools. It's a tight fit, I had to sand the inside of the cap just a little bit to get a snug, but easily removable fit on my spools.
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